from machine import Pin
from utime import sleep

print("Hello, ESP32!")

led1 = Pin(15, Pin.OUT)
led2 = Pin(2, Pin.OUT)
led3 = Pin(4, Pin.OUT)
led4 = Pin(33, Pin.OUT)

while True:
  while True:
    led1.on()
    sleep(0.1)
    led1.off()
    led2.on()
    sleep(0.1)
    led2.off()
    led3.on()
    sleep(0.1)
    led3.off()
    led4.on()
    sleep(0.1)
    led4.off()
  break
  while True:
    led4.on()
    sleep(0.1)
    led4.off()
    led3.on()
    sleep(0.1)
    led3.off()
    led2.on()
    sleep(0.1)
    led2.off()
    led1.on()
    sleep(0.1)
    led1.off()
    break